ABSTRACT

The proposed paper presents a simplified analytical method for predicting the resistance of ship bottom structure subjected to grounding over a sharp rock idealised as an elliptic paraboloid. During grounding, sharp rock may lead to earlier penetration and serious consequences, such as compartment flooding, oil leakage. Therefore, it is of great importance to assess the response of a ship’s bottom structure rapidly and accurately during grounding scenarios. Two new theoretical models, based on plastic limit analysis, are derived with the objective to capture the main failure modes of bottom plating and floors. Proposed formulations are then confronted to Ls-Dyna numerical simulations and other formulas from the literature, considering different rocks, penetrations, and friction coefficients. A good agreement between analytical and numerical results is found and it is concluded the proposed model can be advantageously used to assess at the pre-design stage the crashworthiness of a grounded ship bottom.

摘要

所提出的论文提出了一种简化的分析方法，用于预测在理想化为椭圆抛物面的尖锐岩石上搁浅的船底结构的阻力。在接地过程中，尖锐的岩石可能会导致早期渗透和严重后果，如舱室浸水、漏油。因此，在搁浅情况下快速准确地评估船底结构的响应非常重要。两个基于塑性极限分析的新理论模型被推导出来，目的是捕捉底板和底板的主要失效模式。然后，考虑到不同的岩石、穿透力和摩擦系数，建议的公式面临 Ls-Dyna 数值模拟和文献中的其他公式。